[root@localhost anurag]# rpm -Uvh libstdc++-4.0.1-4.fc4.i386.rpm
rpm: error while loading shared libraries: libstdc++.so.6: cannot open
shared object file: No such file or directory

This is what the error comes when I try to upgrade, run a file, firefox,
anything.

I had gcc-4.0.1-4.fc4 installed on my system. I was trying out with vmware.
It required me to use the same version of gcc as the kernel was compiled
with. So, I downgraded all the gcc and its dependencies and the things which
depended on it to the lower version(fc4 default). Now, its not able to run
anything. Is there any cure? Yeah, my gnome is working,
but no KDE, no Kaffeine, no firefox and not even the rpm command.
Please help asap.

Your best bet is probably to unpack the rpm on another system (you can use rpm2tgz and just untar it into a temp directory). Then just scp the root of it to / and you should be ok... providing you can use scp.

If you can't, boot off a live cd, mount your file system to a temp mount point, and do it from there.

"I had gcc-4.0.1-4.fc4 installed on my system. I was trying out with vmware.
It required me to use the same version of gcc as the kernel was compiled
with."

Wouldn't it have been easier to recompile your kernel with gcc-4.0.1-4.fc4 than trying to downgrade gcc?

--------------------------
Steve Stites

It was easier to downgrade GCC. With a connection speed of 300 KB/sec, it was so so easy to just download all packages needed to be downgraded and...

rpm --oldpackage -Uvh *.rpm

Anyways, I solved the problem finally.

rpm2cpio libstdc++-4.0.1-4.fc4.i386.rpm | cpio -dimv
(on a different machine)

and then scped the files to my system at the correct place. Works now. Thanks a lot.